Semi traditional japanese clothing called...?

I'm going to a costume party as shoko asahara, deranged cult leader, and mass murderer.
I want to know what the kind of jump suits he wears are called and where i might buy them.
here is a video of him in a orange/brown one:
http://www.youtube.com/watch?v=TmQtPgOVi...
thanks for your help in advance.

3 answers 3